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in Physics by (30.0k points)

(i) Why is zener diode fabricated by heavily doping both p-and r-sides of the junction ?

(ii) Draw the circuit diagram of zener diode as a voltage regulator and briefly explain its working.

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(i) Due to the heavy doping the depletion layer becomes very thin and electric field, across the junction, becomes very high even for a small reverse bias voltage.

(ii) Circuit diagram.

Any increase/decrease in the input voltage results in increase/ decrease of the voltage drop across RL without any change in the voltage across the Zener diode.

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